C#

String data = Regex.Match(sentence , @"ID:\d{10}", RegexOptions.IgnoreCase).Value;
string[] digits = Regex.Split(sentence, @"\D+");

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;

namespace TreadStackMemberAccess
{
    public class Program
    {
        static void Main(string[] args)
        {
            Test1 oTest1 = new Test1();
            oTest1.Method1();
        }
    }

    public class TestBase
    {
        public string TestProperty { get; set; }
    }

    public class Test1 : TestBase
    {
        public void Method1()
        {
            TestProperty = "Test1";
            Test2 oTest2 = new Test2();
            oTest2.Method2();
        }
    }

    public class Test2
    {
        public void Method2()
        {
            Test3 oTest3 = new Test3();
            oTest3.Method3();
        }
    }
    
    public class Test3
    {
        public void Method3()
        {
            System.Diagnostics.StackFrame[] oStackFrames = (new System.Diagnostics.StackTrace()).GetFrames();

            for (int i = 0; i < oStackFrames.Length; i++)
            {
                System.Diagnostics.StackFrame oStackFrame = (System.Diagnostics.StackFrame)(oStackFrames[i]);

                if (oStackFrame.GetMethod().ReflectedType.IsSubclassOf(typeof(TestBase)))
                {
                    // ??? How do I access the TestProperty of oTest1, and instance of the Test1 class, which is a subclass of TestBase ???
                }
            }
        }
    }
}